Carpet-sewing machine



(No Model.) 2 Sheets-Sheet 1.

O. G. ,VOLBERG.

CARPET SEWING MAGHINE.

No. 547,191. Patented Oct. 1,1895.

AN DREW $.GRMIAM. PHOTO-LI'H'IDVWASNINGTUKQC (No Model.) 2 Sheets-Sheet2 C. C. VOLBERG.

CARPET SEWING MACHINE.

No. 547,191. Patented 00t..1, 1895.

FTQEE CHARLES C. VOLBERG, OF ALAMEDA, CALIFORNIA.

CARPET-SEWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 547,191, datedOctoberl, 1895.

Application filed November 17, 1894- Serial No. 529,159. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES CHRISTIAN VOLBERG, a citizen of the UnitedStates, re siding at Alameda, county of Alameda, State of California,have invented an Improvement States No. 296,744, issued to GeorgeGrisel,

April 15, 1894. The general arrangement of parts shown in said formerpatent, though varied somewhat in practice in the manufac-' ture of themachines, has been substantially adhered to in that the necessaryadjustments of the looper are still effected from two points of contactby two set-screws, both of which have been necessary in acting upon thefinger as heretofore constructed and hinged to effect the doubleadjustment of the 1ooper namely, its movement to proper proximity withthe needle and its rise up under and beyond the needle. The difficultyof these old means of adjustment, both that shown in the patent and thatused in practice, has been the uncertainty and inaccuracy of theregulation due to having to adjust the finger at two points, renderingit possible to adjust one too much and the other too little, and viceversa.

The necessity for adjustment in a carpetsewing machine is a frequentone, as the neodles Working through the hard material often become bent,requiring constant watchfulness on the part of the operator to adjustthe looper up to the new position of the needle, and thus to avoiddropping of stitches. The object of my invention is to overcome thisinaccuracy and uncertainty of adjustment by providing such aconstruction that I am enabled to dispense with the adjustment of thefinger-piece at two points, and so construct and mount it that by theoperation of a single set-screw both adjustments will be efiectedaccurately and'with facility.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 represents aside view of aportion of acarpet-sewing machine embodying my invention, showing a portion of thedisk L broken away. Fig. 2 is a detail viewshowing the relativepositions of the needle and looper and also the mounting of the looperinlever L. Fig. 3 is a perspective view of my invention.

It is unnecessary herein to illustrate or to describe the wholecarpet-sewing machine, as it will be sufficient to show the partsimmediately surrounding the looper, whereby the means for properlyadjusting it may be readily understood.

G is the vibrating needle-arm, which carries the needle A.

B is the looper adapted to oscillate across the path of the needle andto pass closely under it and up beyond it.

L is a disk provided with a groove-cam,

which receives a roller-stud l of a looper-actuating lever L, pivoted atZ to a portion of the frame, and having oscillation from the pivotforward and back.

The parts thus described are similar to those in the patent abovementioned and to those in the machine as manufactured.

The bar which is carried by the lower end of the looper-actuating leverL and which I have herein lettered L is set by a screw l fixedly uponthe shaft or stem 1) of the looper B. This bar has approximately theshape of a bell-crank lever and is set at its angle upon the shaft ofthe looper, said shaft being mounted and adapted to rock in a suitablebearing in the looper-actuating lever L. The upper arm of the bar isacted upon from be hind by a spring S, which is housed or seated withina socket in the lever L, and the tendency of said spring is to force theupper arm of the bar L outwardly.

Pivoted at Z in the extremity of the lower arm of the bar L is aregulating-lever O, the upper end of which lies face to face with theupright or upper arm of the barLi-and the lower end of which extendsdownwardly and lies normally in contact with the lower end or extensionof the lever L.

A screw D passes through the upper portion of the regulating lever O andbears against the face of the upright arm of bar L and the upper end ofsaid regulating-lever is adapted to come in contact with a fixed part orlug T of the frame of the machine. The set-screw is provided with a headd, adapting it to be readily turned, and said head may have applied toit a spring d, by the frictional contact of which the screw will be heldin the position to which it is adjusted. In the initial position ofthese parts, in which the set-screw D is turned outwardly to its limit,so that the spring S forces the upper portions of the bar and of theregulating-lever to lie parallel and face to face and the lower end ofthe regulating-lever to rest in contact with thelower end of thelooper-actuating lever L, the looper-shaft is so turned downwardly thatthe looper itself is removed to the greatest extent from the plane orpath of the needle, and in this position will be inoperative, as itwould miss the loop and drop the stitch. Now, to set the looper up in asclose proximity to the needle as is necessary to render it operative,the set screw 1) is turned inwardly, and its inner end bearing againstthe upright arm of the bar will force said bar backwardly against itsspring, and thereby raising the looper to proper position under theneedle. In this operation the bar moves, rather than theregulating-lever C, because the regulating-lever has a fixed bearingbetween its lower end and the lower end of the lever L, so that the onlyeffect of the screw D is to turn the regulating-lever about its pivot atb, therebyraisingthelooper. Thissameadjustment of the screw, by varyingthe position of the regulating-lever with relation to theoscillatinglever L and separating the upper end of the regulating-levertherefrom to a greater degree, alters the time of contact of the upperend ofvthe regulatinglever with the log T of the frame, therebyregulating the time and consequently the propinquity of rise of thelooper under and beyond the needle, which rise is effected by theyielding of the regulating-lever and the bar about the pivotal point oftheir common connection through the shaft of the looper with the leverL. Thus a single screw effects both adjustments with accuracy andenables the operator to follow with his looper all the inaccuracies andbendings of the needle during the progress of the work.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a carpet sewing machine, the combination, with the frame providedwith a fixed lug, a reciprocating needle, and a looper actuating lever,of a looper having its shank journaled in said lever, and means foradjusting the looper relative to said needle comprising a two-armed barfixed to thelooper-shaft, a regulating lever, pivoted to one arm of saidbar, having one end normally in contact with an extension of theactuating lever, and its other end in position to contact with saidfixed lug, adjusting means carried by said regulating lever andcooperating with the other arm of said bar, and means forholding thelatter arm in yielding contact with said adjusting means. In witnesswhereof I have hereunto set my hand.

CHARLES C. VOLBERG. \Vitnesses:

S. H. NOURSE, WM. F. BOOTH.

